How to intercept a message: "WM_QUIT || WM_DESTROY || WM_CLOSE" WinAPI - c++

Question

I use this code for the main loop (my function):
while (running)
{
if(is_close)
{
Log().push_log("close", "message close!", logInfo);
running = active = false;
break;
}
while (PeekMessage(&msg, g_hWnd, 0, 0, PM_REMOVE))
{
std::cout << "Wnd: " << msg.message << std::endl;
if (msg.message == WM_QUIT || msg.message == WM_DESTROY || msg.message == WM_CLOSE)
{
MessageBox(0, "Hello, World", "Hello", MB_OK);
running = false;
}
// TranslateMessage(&msg);
DispatchMessage(&msg);
}
if (running && active)
render.DrawObject(g_hDC);
}
Well, then I use WndProc:
LRESULT CALLBACK GLWindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
std::cout << "Wnd Proc: " << msg << std::endl;
return DefWindowProc(hWnd, msg, wParam, lParam);
}
When I'm trying to get the message WM_QUIT, WM_DESTROY, or WM_CLOSE in my function, it does not work. My function does not see messages.
How can I get this message?

Answer 1

PeekMessage or GetMessage will only return messages that were posted to the message queue with PostMessage(). That will never be WM_CLOSE or WM_DESTROY, those messages are sent with SendMessage(), directly delivered to the window procedure and don't go in the message queue. You won't get WM_QUIT unless you've got a PostQuitMessage() call in your code, you don't.
You really do have to write a window procedure for your main window. Simply handling WM_DESTROY and calling PostQuitMessage(0) should be enough.
LRESULT CALLBACK GLWindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
if (msg == WM_DESTROY) PostQuitMessage(0);
return DefWindowProc(hWnd, msg, wParam, lParam);
}
You'll now get WM_QUIT in your game loop.